mirror of https://github.com/webpack/webpack.git
75 lines
1.7 KiB
JavaScript
75 lines
1.7 KiB
JavaScript
/*
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MIT License http://www.opensource.org/licenses/mit-license.php
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Author Tobias Koppers @sokra
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*/
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"use strict";
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const { traverse } = require("@webassemblyjs/ast");
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const { decode } = require("@webassemblyjs/wasm-parser");
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const { Tapable } = require("tapable");
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const WebAssemblyImportDependency = require("./dependencies/WebAssemblyImportDependency");
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const isMemoryImport = moduleImport => moduleImport.descr.type === "Memory";
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const isTableImport = moduleImport => moduleImport.descr.type === "Table";
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const decoderOpts = {
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ignoreCodeSection: true,
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ignoreDataSection: true
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};
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function nonSupportImportOfType(type) {
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const e = new Error("Unsupported import of type " + JSON.stringify(type));
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e.stack = "";
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return e;
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}
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class WebAssemblyParser extends Tapable {
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constructor(options) {
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super();
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this.hooks = {};
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this.options = options;
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}
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parse(binary, state) {
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// flag it as ESM
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state.module.buildMeta.exportsType = "namespace";
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// parse it
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const ast = decode(binary, decoderOpts);
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// extract imports and exports
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const exports = (state.module.buildMeta.providedExports = []);
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traverse(ast, {
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ModuleExport({ node }) {
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exports.push(node.name);
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},
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ModuleImport({ node }) {
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// Prevent importing a Memory or Table for now
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// Depends on https://github.com/WebAssembly/esm-integration
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if (isMemoryImport(node) === true) {
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throw nonSupportImportOfType("Memory");
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}
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if (isTableImport(node) === true) {
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throw nonSupportImportOfType("Table");
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}
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const dep = new WebAssemblyImportDependency(
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node.module,
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node.name,
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node.descr
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);
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state.module.addDependency(dep);
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}
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});
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return state;
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}
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}
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module.exports = WebAssemblyParser;
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